A hydraulic system of a heavy dump truck and its control method

Abstract

The invention discloses a hydraulic system of a heavy-duty dump truck, which comprises a centralized control valve provided with an oil inlet P, an oil supply port CF and an oil supply port EF, the main pump oil outlet is connected to the oil inlet of the centralized control valve, and the oil supply port CF is connected to the first steering unit for oil supply, and the oil supply port EF supplies oil for the support unit and the lifting unit. The double pump includes pump one and pump two, pump one is connected to the second steering unit for oil supply, and pump two is connected to two The oil inlet port of the two-position two-way valve, the two-position two-way valve is provided with oil ports A1 and B1, and the oil port B1 is connected to the oil inlet port of the centralized control valve, and the oil port A1 supplies oil for the support unit and the lifting unit; among them, The main pump and the dual pump receive the ECU signal to control the opening and closing, and the two-position two-way valve receives the ECU signal to control the switching channel. In the present invention, when the main pump fails, the dual pump is activated, and the two-position, two-way valve is switched to the B1 position to continue supplying oil to avoid potential safety hazards; when the first steering unit fails, the dual-connection pump is activated, and the two-position, two-way valve is switched to the A1 position, Continue to supply oil to effectively avoid potential safety hazards.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to a hydraulic system of a heavy dump truck and a control method thereof. Background technique [0002] Heavy-duty dump trucks refer to vehicles that unload goods by themselves through hydraulic or mechanical lifting. It is composed of chassis, hydraulic lifting mechanism, steering system, cargo compartment and other components. In civil engineering and ore mining, heavy-duty dump trucks are often combined with construction machinery such as excavators, loaders, and belt conveyors to form a loading, transporting, and unloading production line for loading and unloading of earthwork, sand, and bulk materials. As a commonly used loading vehicle, when it is heavily loaded, it often encounters steering failure. During the unloading process, the lifting power suddenly loses, which causes huge economic losses, and even serious accidents such as vehicle crashes. Therefore, a T...

AI Technical Summary

Problems solved by technology

[0006] 3. There is no intelligent control system in the existing heavy-duty dump trucks, and operations such as intelligent steering and intelligent lifting cannot be realized;

[0007] 4. The existing emergency steering uses the accumulator to continue to store the oil. When the power fails, the energy is released briefly to ensure the steering. However, the effective steering time of this scheme is short (usually 10S, determined according to the size of the accumulator), and it cannot Solve the lifting problem, no support and other auxiliary actions

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